Angkor was once the largest city on earth. Archaeologists using LiDAR sensors and aerial mapping have found that the area of Angkor was the size of modern-day Los Angeles. What is more interesting is the fact that the early engineers of the 1000-year-old city built an ingenious network of canals and reservoirs throughout the city. The centerpiece of the system is an 8 kilometers long and 2 kilometers wide reservoir built by the early Cambodians as a technological solution to store rainwater and disperse the same to the rice fields during the dry season.    

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